Method of manufacturing semiconductor device

Abstract

A semiconductor device using, e.g., a fluorine containing carbon film, as an interlayer dielectric film is produced by a dual damascene method which is a simple technique. After an dielectric film, e.g., an SiO 2 film 3 , is deposited on a substrate 2 , the SiO 2 film 3 is etched to form a via hole 31 therein, and then, a top dielectric film, e.g., a CF film 4 , is deposited on the top face of the SiO 2 film 3 . If the CF film is deposited by activating a thin-film deposition material having a bad embedded material, e.g., C 6 F 6 gas, as a plasma, the CF film 4 can be deposited on the top face of the SiO2 film 3 while inhibiting the CF film from being embedded into the via hole 31 . Subsequently, by etching the CF film 4 to form a groove 41 therein, it is possible to easily produce a dual damascene shape wherein the groove 41 is integrated with the via hole 31.

What is claimed is:  
     
       1. A method of manufacturing a semiconductor device, said method comprising the steps of: 
       forming a dielectric film on an object to be treated;  
       etching said dielectric film to form a via hole therein;  
       forming a top dielectric film having an etch selectivity, which is different from that of said dielectric film and which is substantially equal to that of a resist, on a surface of said dielectric film, in which said via hole has been formed, so as to straddle an opening of said via hole;  
       forming a resist of a predetermined pattern on said top dielectric film;  
       etching said top dielectric film to form therein a groove, in which a metal is embedded for forming a wiring, so that said groove contacts at least a part of said via hole, and simultaneously ashing said resist; and  
       continuously etching said top dielectric film for a predetermined period of time after said etching of said top dielectric film is completed, so that said top dielectric film deposited in said via hole is etched to be removed.  
     
     
       2. A method of manufacturing a semiconductor device as set forth in  claim 1 , wherein said dielectric film is an interlayer dielectric film in a semiconductor device having a multi-layer metallization structure. 
     
     
       3. A method of manufacturing a semiconductor device as set forth in  claim 1 , wherein said top dielectric film is a fluorine containing carbon film. 
     
     
       4. A method of manufacturing a semiconductor device as set forth in  claim 1 , wherein said top dielectric film is a coating film. 
     
     
       5. A method of manufacturing a semiconductor device, said method comprising the steps of: 
       forming a dielectric film on an object to be treated;  
       etching said dielectric film to form a via hole therein;  
       forming a thin film having an etch selectivity, which is different from that of said dielectric film, on a surface of said dielectric film in which said via hole has been formed;  
       forming a top dielectric film having an etch selectivity, which is substantially equal to those of said dielectric film and a resist, on a surface of said thin film;  
       forming a resist of a predetermined pattern on said top dielectric film;  
       continuously etching said top dielectric film to form therein a groove, in which a metal is embedded for forming a wiring, so that said groove contacts at least a part of said via hole, and simultaneously ashing said resist; and  
       etching said top dielectric film for a predetermined period of time after said etching of said top dielectric film is completed, so that said top dielectric film deposited in said via hole is etched to be removed.  
     
     
       6. A method of manufacturing a semiconductor device as set forth in  claim 5 , wherein said top dielectric film is formed so as to straddle an opening of said via hole. 
     
     
       7. A method of manufacturing a semiconductor device as set forth in  claim 5 , wherein said dielectric film is an interlayer dielectric film in a semiconductor device having a multi-layer metallization structure. 
     
     
       8. A method of manufacturing a semiconductor device as set forth in  claim 5 , wherein said top dielectric film is a fluorine containing carbon film. 
     
     
       9. A method of manufacturing a semiconductor device as set forth in  claim 5 , wherein said top dielectric film is a coating film.